Hey guys I am new to the computer but not to mopeds so here is my input. BTW I have 2 Tomos targa Lx's and a Puch maxi.
first for the magneeto one of mine had that idm magneeto and it needed to be replaced. I got a new Iskra magneeto and the cdi module from www.mopedwarehouse.com for like $150.00. Now it has the same set up as on my other tomos and works great. Also you should be able to get a a-35 head anywhere for about $10.00 used. They are only $25.00 new and they should be in plentiful supply since so many people take them off for the 70 cc kit.
Both of my tomos had 22 tooth rear sprockets and I Got replacements from mopedwarehouse for $16.00
They also had the front sprocket. I have a 27 tooth on one bike and the 25 tooth on the other.
Last thing, I have one of the athena 70 cc kits on the bike with the 27 tooth sprocket . the orignal piston shattered and destroyed the cylinder of the old 70 cc kit. I was able to use all of the old kit parts however , intake, carb exhaust. I did have to get the athena head which you will be happy you did since I have not blown one head gasket since doing so in contrast to my weakly head gasket replacement before. This new kit is much better in power and does not rattle as much as the old kit.